1. tender (adj.): tend- + -er. 应该是由于很柔软、很细嫩、很纤弱的东西很容易拉伸，由此引申形容那些很容易拉伸、很容易因拉伸而受伤、一拉就痛的的东西。
2. 即：the things that can be stretched easily, or it could be easily painful by stretching.
3. 用一个不存在但很贴切的词形容就是：非常的*stretchable.
4. tender + -ness.

1. She smiled, politely rather than with tenderness or gratitude.

她只是出于礼貌地笑了笑，而非出于关心或感激。

来自柯林斯例句

2. There is still some tenderness in her tummy.

她的肚子还有点疼。

来自柯林斯例句

3. He felt a brief wave of tenderness towards his old teacher.

他对他年迈的老师湧起了一股爱怜之情.

来自《简明英汉词典》

4. There was tenderness in his face as he looked at her.

他看着她的时候满脸温柔.

来自《简明英汉词典》

5. She spoke with loving tenderness.

她亲切慈爱地讲话.

来自《简明英汉词典》